| 1. | During the Second World War, the equatorial mount and transit circle were lost.
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| 2. | He possessed several valuable instruments, among which was one of Troughton's best transit circles.
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| 3. | The prime meridian passes through the transit circle ( ) of the Greenwich observatory.
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| 4. | When the observatory was built, he used a Jones Mural Circle and a Dolland Transit Circle.
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| 5. | Thereupon he rejoined the Naval Observatory, and began working in the 6 " Transit Circle Division.
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| 6. | Following the death of Martins, the Repsolds again took the lead and made many transit circles.
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| 7. | He created the Groombridge Transit Circle in 1806, which Stephen Groombridge used to compile his star catalogue.
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| 8. | Between 1967 & ndash; 69 he assisted in positional observations with the observatory's 7 " transit circle.
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| 9. | When the Airy transit circle was built, a mercury basin was used to align the telescope to the perpendicular.
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| 10. | The meridian chosen was that which passed through the Airy transit circle at Greenwich and it became the prime meridian.
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